Battery cell shell assembly, battery cell and battery pack

Abstract

The invention relates to the technical field of batteries, and discloses a battery cell shell assembly, a battery cell and a battery pack, and the battery cell shell assembly mainly comprises a shell, a cover plate and a pole. One end of the shell is provided with an opening; the cover plate covers the opening and is connected with the shell, the cover plate comprises a plurality of sub-plates which are sequentially connected, a connecting part is arranged between every two adjacent sub-plates, the mounting height of each sub-plate is reduced in a step shape from the middle to the two ends, and a plurality of step parts for supporting the sub-plates are correspondingly arranged at the end, provided with the opening, of the shell; and the pole is arranged on the daughter board at the end part. According to the battery cell shell assembly, the cover plate comprises the multiple sub-plates which are distributed in the step shape, and the pole columns are mounted on the sub-plates at the lower positions, so that the sub-plates at the higher positions bear external impact, the short circuit of the battery cell caused by the stress of the pole columns is avoided, and the use safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to cell housing assemblies, cells, and battery packs. Background Technology

[0002] New energy batteries have advantages such as large capacity, high operating voltage, strong charge retention capacity, and long cycle life. They are currently widely used in many fields such as transportation power supply, power storage power supply, new energy storage power supply, and aerospace and military industries.

[0003] like Figure 1 As shown, the battery cell mainly includes components such as electrolyte, electrode assembly 6', bare cell insulating sheet, cover plate 2', housing 1', top patch, and insulating film 5'. The housing 1' and cover plate 2' are fixedly connected by welding, together forming a closed space to accommodate the electrode assembly 6'. Figure 2 As shown, the cover plate 2' typically integrates functional areas such as the electrode post 3', injection port, and explosion-proof valve. The cover plate 2' is usually a planar structure, with the electrode post 3' protruding upwards from the surface of the cover plate 2' by approximately 2 mm to 3.5 mm. For example... Figure 3 As shown, during the battery pack assembly process, the busbar 7' is usually welded to the upper surface of the terminal post 3' to achieve electrical connection between the cells. Then, the busbar 7' is attached and fixed to the battery pack cover using thermally conductive structural adhesive.

[0004] However, the area on the upper surface of the cover plate between the two terminals is not in contact with the cover, leaving a gap, which results in lower overall structural strength of the battery cell. When the battery pack cover is subjected to external impact, the impact force will act directly on the terminals. After the terminals are stressed, it is easy to cause abnormal internal connections in the battery pack, resulting in short circuits in the cells, thus affecting the safety of the battery pack. Summary of the Invention

[0005] This invention provides a cell housing assembly, a cell, and a battery pack to solve the problem that when the battery pack cover is subjected to external impact, the impact force acts directly on the terminals, which can easily cause short circuits in the cells and affect safety during use.

[0006] In a first aspect, the present invention provides a battery cell housing assembly, comprising: The housing has an opening at one end along the Z direction; A cover plate is provided on the opening and connected to the housing. The cover plate includes a plurality of sub-plates connected sequentially along the X direction. A connecting part extending along the Z direction is provided between adjacent sub-plates. The installation height of each sub-plate along the Z direction decreases in a stepped manner from the middle to both ends. The end of the housing with the opening is provided with a plurality of stepped parts that support each sub-plate. The pole is located on the subplate at the end in the X direction.

[0007] Beneficial Effects: The battery cell housing assembly of the present invention, by configuring the cover plate as multiple sub-plates arranged in a stepped manner and installing them in conjunction with multiple corresponding stepped portions on the housing, creates a stepped structure for the cover plate as a whole, and installs the terminals on the lower sub-plates. On the one hand, this increases the contact area between the cover plate and the battery pack cover, reduces the installation height of the terminals, and causes external impact forces to first impact the middle sub-plates, then disperse and transfer the impact force to the housing through multiple sub-plates, avoiding stress concentration on the terminals and improving the structural strength and safety of the battery cell. On the other hand, reducing the gap between the electrode assembly and the cover plate also improves the space utilization of the battery cell, thereby increasing the energy density of the battery cell.

[0008] In one optional embodiment, the housing includes a base plate, two large panels disposed on opposite sides of the base plate along the Y direction, and two narrow side plates disposed on opposite sides of the base plate along the X direction. A plurality of stepped portions are disposed on the top of the large panels. The height of the narrow side plates along the Z direction is H1, and the sum of the heights of each stepped portion along the Z direction is H2. The height of each stepped portion along the Z direction is the distance between its step surface and the step surface of the adjacent stepped portion. The wall thickness of the large panels is T1, satisfying 0.6 ≤ H2. 2 / (H1×T1)≤0.85.

[0009] Beneficial effects: By controlling H2 2 / (H1×T1) Within a suitable range, the shell has sufficient structural strength to support the cover plate while also ensuring the yield of stamping. This allows the shell to have good fluidity and deformation uniformity when stamping the stepped part, which helps to ensure the flatness and sealing reliability of the welding surface between the shell and the cover plate.

[0010] In one alternative implementation, 0.6 mm ≤ T1 ≤ 0.8 mm, 90 mm ≤ H1 ≤ 120 mm; And / or, the thickness of the base plate is T2, which satisfies 1 mm ≤ T2 ≤ 1.2 mm.

[0011] Beneficial effects: By controlling T1, H1 and T2 within a suitable range, the rigidity and strength of the shell are ensured, and the risk of defects such as cracking and wrinkling during stamping of the shell at the stepped part is reduced.

[0012] In one alternative embodiment, the sum of the areas of the outer surfaces of each of the steps on each of the large panels is S, wherein S is constructed as the area enclosed in the XZ plane by the projected outer contour of each of the steps in the XZ plane and the top surface of the narrow side plate along the Z direction, satisfying 1.7≤S / (T1×1000)≤1.85.

[0013] Beneficial effects: By controlling S / (T1×1000) within a suitable range, it is beneficial to balance the degree of material stretching during the stamping process, avoid affecting the structural strength due to excessive thinning in some areas, and also improve the stamping yield.

[0014] In one optional embodiment, the plurality of steps include a first step, two second steps and two third steps, the two second steps are respectively disposed on opposite sides of the first step along the X direction, the two third steps are respectively disposed on the side of the two second steps away from the first step along the X direction, and the height of the third step along the Z direction is H3, satisfying 2.5≤H3 / T1≤3.

[0015] Beneficial effects: By controlling H3 / T1 within a suitable range, the third step is ensured to have sufficient depth to accommodate the pole post, thereby reducing the installation height of the pole post. At the same time, the deformation of the housing during the stamping of the third step is controllable, stress concentration is avoided, and the stamping yield is further improved.

[0016] In one optional embodiment, the height between the step surface of the second step and the step surface of the third step along the Z direction is H4, and the height between the step surface of the first step and the step surface of the second step along the Z direction is H5, satisfying 2 mm ≤ H4 ≤ 3.5 mm and 2 mm ≤ H5 ≤ 3 mm. And / or, along the X direction, the distance between the third step and the adjacent side of the large panel is L1, satisfying 5 mm ≤ L1 ≤ 10 mm.

[0017] Beneficial effects: Further control of H4 and H5 within a suitable range allows for precise adjustment of the height difference between each step, resulting in a smoother transition between adjacent steps. This also ensures more uniform and smooth material deformation of the shell during stamping of each step, improving stamping quality. By controlling L1 within a suitable range, a buffer transition area is formed, reducing the risk of tearing or cracking during stamping and further improving stamping yield.

[0018] In one optional embodiment, the plurality of sub-boards respectively include a first sub-board, two second sub-boards and two third sub-boards, the first sub-board is disposed on the first step, the two second sub-boards are respectively disposed on the second step, and the two third sub-boards are respectively disposed on the third step. The terminal post includes a positive terminal post and a negative terminal post, and the positive terminal post and the negative terminal post are respectively disposed on the two third sub-boards.

[0019] Beneficial effects: By placing the positive and negative terminals on the two third sub-boards respectively, the installation height of the positive and negative terminals can be reduced, avoiding the direct application of external forces to the positive and negative terminals when the cells are assembled into a battery pack, thereby reducing the risk of abnormal internal connections and short circuits in the battery pack.

[0020] In one alternative embodiment, the first sub-board is provided with an explosion-proof valve, and the two second sub-boards are respectively coated with an adhesive layer and adapted to be connected to the battery pack cover through the adhesive layer.

[0021] Beneficial effects: The explosion-proof valve is located on the highest first sub-plate, which facilitates pressure relief and is less susceptible to interference; the second sub-plate is directly bonded to the box cover through an adhesive layer, which increases the fixed contact area between the battery cell and the box cover, significantly improving the structural strength and impact resistance of the battery cell after assembly into the battery pack, and also expanding the heat dissipation area of ​​the battery cell, thereby improving heat dissipation capacity.

[0022] Secondly, the present invention also provides a battery cell, comprising: pole group; In the aforementioned battery cell housing assembly, the electrode group is disposed within the housing.

[0023] Beneficial Effects: The battery cell of this invention, by configuring the cover plate as multiple sub-plates arranged in a stepped manner and installing them in conjunction with multiple corresponding stepped portions on the housing, creates a stepped structure for the entire cover plate, with the terminals installed on the lower sub-plates. On one hand, this increases the contact area between the cover plate and the battery pack cover, reduces the installation height of the terminals, and ensures that external impact forces first strike the middle sub-plates, then disperse and transfer the impact force to the housing through multiple sub-plates, avoiding stress concentration on the terminals and improving the structural strength and safety of the battery cell. On the other hand, reducing the gap between the electrode assembly and the cover plate also improves the space utilization of the battery cell, thereby increasing its energy density.

[0024] Thirdly, the present invention also provides a battery pack, comprising: The lid and body of the box together form the storage space; Multiple of the aforementioned battery cells are disposed within the accommodating space.

[0025] Beneficial effects: Since the battery pack includes battery cells, it has the same effects as the battery cells, which will not be repeated here. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 An exploded view of an existing battery cell; Figure 2 A schematic diagram of the existing cover plate for battery cells; Figure 3 This is a schematic diagram of the existing battery cells interconnected via busbars. Figure 4 A schematic diagram of existing battery cells; Figure 5 This is a schematic diagram of the battery cell structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the cover plate of the battery cell housing assembly according to an embodiment of the present invention; Figure 7 This is a front view of the cover plate of the battery cell housing assembly according to an embodiment of the present invention; Figure 8 This is a top view of the cover plate of the battery cell housing assembly according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the battery cell housing assembly according to an embodiment of the present invention; Figure 10 This is a front view of the housing of the battery cell housing assembly according to an embodiment of the present invention; Figure 11 for Figure 10 Enlarged view of a portion at point A; Figure 12 This is a top view of the housing of the battery cell housing assembly according to an embodiment of the present invention; Figure 13 for Figure 12 A magnified view of section B.

[0028] Explanation of reference numerals in the attached figures: Existing technology: 1', housing; 2', cover plate; 3', pole post; 5', insulating film; 6', pole group; 7', busbar; This application includes: 1. Shell; 101. Stepped portion; 1011. First step; 1012. Second step; 1013. Third step; 102. Base plate; 103. Large panel; 104. Narrow side plate; 2. Cover plate; 201. Sub-plate; 2011. First sub-plate; 2012. Second sub-plate; 2013. Third sub-plate; 202. Connecting portion; 203. Reinforcing rib; 3. Terminal post; 301. Positive terminal post; 302. Negative terminal post; 4. Explosion-proof valve. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of the embodiments of the present invention, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present invention, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces), unless otherwise explicitly specified.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] In the description of the embodiments of this invention, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0033] The battery cell mentioned in this embodiment of the invention is the smallest unit that makes up a battery, and it can independently perform the functions of charging and discharging. This embodiment of the invention does not impose any particular limitations on the type or shape of the battery cell; it can be a blade cell, a prismatic cell, or other types of battery cells. The battery cell in this embodiment of the invention can be a lithium-ion cell, a potassium-ion cell, a sodium-ion cell, a lithium-sulfur cell, etc., with lithium-ion cells being particularly preferred.

[0034] A battery cell typically includes an electrode assembly, also known as an electrode group. The electrode group consists of a positive electrode, a negative electrode, and a separator. During the charging and discharging process, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrode plates. The separator, positioned between the positive and negative electrode plates, prevents short circuits while allowing active ions to pass through.

[0035] The battery cell also includes a casing and a cover plate. The casing and cover plate, when connected, form a sealed space encapsulating the electrode assembly and electrolyte. The casing is generally made of metal materials, such as steel, aluminum, or composite metals (e.g., copper-aluminum composite). The cover plate can also integrate components such as terminals, explosion-proof valves, and electrolyte filling holes. The ends of the electrode assembly taper to form tabs, which are electrically connected to the terminals to enable charging and discharging of the electrode assembly.

[0036] like Figure 2 and Figure 3As shown, the existing cover plate 2' is typically a planar structure. The terminal post 3' protrudes upward from the surface of the cover plate 2' and is welded to the busbar 7'. The busbar 7' is then bonded and fixed to the battery pack cover using a thermally conductive adhesive structure. The area on the upper surface of the cover plate 2' between the two terminal posts 3' does not contact the cover, resulting in a gap. This leads to lower overall structural strength of the battery cell and lower space utilization. When the battery pack cover is subjected to external impact, the impact force will directly act on the terminal post 3'. The terminal post 3', under stress, is prone to abnormal internal connections within the battery pack, easily causing short circuits in the battery cell and affecting safety. Furthermore, the battery cell only conducts heat through contact between the terminal post 3' and the thermally conductive adhesive structure, resulting in poor heat dissipation.

[0037] like Figure 4 As shown, in order to leave space for the tab bending, the height of the lower plastic of the cover plate 2' is usually about 6 mm to 9 mm, and a gap of about 4 mm to 6 mm is formed between the pole group 6' and the cover plate 2' below the pole post 3'. This gap is not utilized, which further reduces the space utilization rate of the cell.

[0038] The following is combined with Figures 5 to 13 The following describes embodiments of the present invention.

[0039] According to embodiments of the present invention, in one aspect, such as Figure 5 As shown, a battery cell housing assembly is provided, mainly including: a housing 1, a cover plate 2, and a terminal post 3. The housing 1 has an opening at one end along the Z-direction. The cover plate 2 covers the opening and connects to the housing 1. The cover plate 2 includes multiple sub-plates 201 connected sequentially along the X-direction. Connecting portions 202 extending along the Z-direction are provided between adjacent sub-plates 201. The installation height of each sub-plate 201 along the Z-direction decreases in a stepped manner from the middle to both ends. The end of the housing 1 with the opening has multiple stepped portions 101 corresponding to support each sub-plate 201. The terminal post 3 is disposed on the sub-plate 201 located at the X-direction end.

[0040] Therefore, the battery cell housing assembly provided in this embodiment of the invention, by setting the cover plate 2 as a plurality of sub-plates 201 arranged in a stepped manner and installing them in conjunction with a plurality of corresponding stepped portions 101 on the housing 1, makes the cover plate 2 form a stepped structure as a whole, and the terminal post 3 is installed on the lower sub-plate 201. On the one hand, it increases the contact area between the cover plate 2 and the battery pack cover, reduces the installation height of the terminal post 3, so that the external impact force first impacts the sub-plate 201 in the middle position, and the impact force is dispersed and transmitted to the housing 1 through the multiple sub-plates 201. The battery cell housing assembly as a whole bears the impact force, avoiding stress concentration on the terminal post 3, thereby improving the structural strength and safety of the battery cell. On the other hand, it reduces the gap between the electrode group and the cover plate 2, and also improves the space utilization of the battery cell, thereby improving the energy density of the battery cell.

[0041] Specifically, the Z direction is also the height direction of shell 1, such as Figure 5 As shown by arrow Z in the diagram, the X direction is also the length direction of shell 1, as shown in the diagram. Figure 5 As indicated by arrow X, the Y direction is also the width direction of shell 1, as shown in the image. Figure 5 As indicated by the arrow Y in the diagram.

[0042] The cover plate 2 and the shell 1 can be fixed by welding. The shell 1 can be formed by stamping, forming a stepped portion 101. The shell 1 can be made of aluminum sheet, with good stamping formability, aluminum content ≥98%, tensile strength ≥210 MPa, yield strength ≥175 MPa, and elongation ≥1%.

[0043] Similarly, the cover plate 2 can be stamped to form multiple sub-plates 201, or it can be made of aluminum plate. Each sub-plate 201 forms a stepped structure through a connecting part 202 extending along the Z direction.

[0044] In one embodiment, such as Figure 9 and Figure 12 As shown, the housing 1 includes a base plate 102, two large panels 103 disposed on opposite sides of the base plate 102 along the Y direction, and two narrow side panels 104 disposed on opposite sides of the base plate 102 along the X direction. Multiple stepped portions 101 are disposed on the top of the large panels 103. The two large panels 103 and the two narrow side panels 104 surround the base plate 102 and form a space for mounting the electrode assembly and an opening.

[0045] like Figure 10 and Figure 13 As shown, the height of the narrow side panel 104 along the Z direction is H1, and the sum of the heights of each step portion 101 along the Z direction is H2. The height of each step portion 101 along the Z direction is the distance between its step surface and the step surface of the adjacent step portion 101. The wall thickness of the large panel 103 is T1, satisfying 0.6 ≤ H2. 2 / (H1×T1)≤0.85.

[0046] By controlling H2 2 / (H1×T1) Within a suitable range, the shell 1 has sufficient structural strength to support the cover plate 2, while also taking into account the yield of stamping. This ensures that the shell 1 has good fluidity and deformation uniformity when stamping the stepped part 101, which is beneficial to ensuring the flatness and sealing reliability of the welding surface between the shell 1 and the cover plate 2.

[0047] Furthermore, in one embodiment, 0.6 mm ≤ T1 ≤ 0.8 mm, and 90 mm ≤ H1 ≤ 120 mm.

[0048] And / or, the thickness of the base plate 102 is T2, which satisfies 1 mm ≤ T2 ≤ 1.2 mm.

[0049] By controlling T1, H1, and T2 within appropriate ranges, the rigidity and strength of the shell 1 are ensured, reducing the risk of defects such as cracking and wrinkling at the stepped part 101 during stamping.

[0050] Furthermore, such as Figure 12 As shown, the length of the large panel 103 along the X direction is L2, which satisfies 150 mm ≤ L2 ≤ 300 mm. The width of the narrow side panel 104 along the Y direction is W1, which satisfies 28 mm ≤ L2 ≤ 75 mm.

[0051] In one embodiment, such as Figure 10 As shown, the sum of the outer surface areas of each step portion 101 on each large panel 103 is S. S is the area enclosed in the XZ plane by the projected outer contour of each step portion 101 on the XZ plane and the top surface of the narrow side plate 104 along the Z direction, satisfying 1.7 ≤ S / (T1×1000) ≤ 1.85. By controlling S / (T1×1000) within a suitable range, it is beneficial to balance the degree of material stretching during the stamping process, avoid affecting the structural strength due to excessive local thinning, and also improve the stamping yield.

[0052] In one embodiment, such as Figure 9 , Figure 10 and Figure 11 As shown, the multiple stepped sections 101 include a first step 1011, two second steps 1012 and two third steps 1013. The two second steps 1012 are respectively located on opposite sides of the first step 1011 along the X direction, and the two third steps 1013 are respectively located on the side of the two second steps 1012 away from the first step 1011 along the X direction. The height of the third step 1013 along the Z direction is H3, which satisfies 2.5≤H3 / T1≤3.

[0053] By controlling H3 / T1 within a suitable range, the third step 1013 is ensured to have sufficient depth to accommodate the pole post 3, thereby reducing the installation height of the pole post 3. At the same time, the deformation of the housing 1 during the stamping of the third step 1013 is controllable, stress concentration is avoided, and the stamping yield is further improved.

[0054] Furthermore, in one embodiment, such as Figure 11As shown, along the Z-direction, the height between the step surface of the second step 1012 and the step surface of the third step 1013 is H4, and along the Z-direction, the height between the step surface of the first step 1011 and the step surface of the second step 1012 is H5, satisfying 2 mm ≤ H4 ≤ 3.5 mm and 2 mm ≤ H5 ≤ 3 mm. Further controlling H4 and H5 within a suitable range allows for precise adjustment of the height difference between each step 101, making the transition between adjacent steps 101 smoother. This also ensures more uniform and smooth material deformation of the housing 1 during stamping of each step 101, thus improving the stamping quality.

[0055] For ease of description, in the embodiments of the present invention, H4 is the height of the second step 1012 along the Z direction, and H5 is the height of the first step 1011 along the Z direction.

[0056] Furthermore, in one embodiment, such as Figure 11 As shown, along the X direction, the distance between the third step 1013 and the adjacent side of the large panel 103 is L1, which satisfies 5 mm ≤ L1 ≤ 10 mm. By controlling L1 within a suitable range, a buffer transition area is formed, which can reduce the risk of tearing or cracking during the stamping process and further improve the stamping yield.

[0057] For example, in an embodiment of the present invention, L1 can be any value among 5 mm, 8 mm, and 10 mm, or a value between any two values.

[0058] In one embodiment, such as Figure 6 , Figure 7 and Figure 8 As shown, the multiple sub-boards 201 include a first sub-board 2011, two second sub-boards 2012, and two third sub-boards 2013. The first sub-board 2011 is mounted on the first step 1011, the two second sub-boards 2012 are mounted on the second step 1012, and the two third sub-boards 2013 are mounted on the third step 1013. The terminal post 3 includes a positive terminal post 301 and a negative terminal post 302, which are respectively mounted on the two third sub-boards 2013.

[0059] By placing the positive terminal 301 and the negative terminal 302 on two third sub-boards 2013 respectively, the installation height of the positive terminal 301 and the negative terminal 302 can be reduced, avoiding the direct application of external force to the positive terminal 301 and the negative terminal 302 when the cells are assembled into a battery pack, thereby reducing the risk of abnormal internal connection of the battery pack and causing a short circuit.

[0060] Furthermore, in one embodiment, such as Figure 6As shown, the first sub-board 2011 is equipped with an explosion-proof valve 4, and the two second sub-boards 2012 are each coated with an adhesive layer, suitable for connection to the battery pack cover via the adhesive layer. The explosion-proof valve 4 is located on the highest first sub-board 2011, facilitating pressure relief and minimizing interference. The second sub-boards 2012 are directly bonded to the cover via the adhesive layer, increasing the contact area between the battery cell and the cover, significantly improving the structural strength and impact resistance of the battery cell after assembly in the battery pack, and also expanding the heat dissipation area of ​​the battery cell, thus enhancing heat dissipation capacity.

[0061] Furthermore, in one embodiment, such as Figure 6 and Figure 7 As shown, the second sub-plate 2012 is also provided with reinforcing ribs 203 on both sides along the Y direction. The reinforcing ribs 203 also extend to the first sub-plate 2011 and the second sub-plate 2012 in a partial manner to improve the structural strength of the cover plate 2.

[0062] Of course, other reinforcing structures can be selectively installed in other locations as needed. For example, a reinforcing block is provided at the middle position of the connection between the first sub-board 2011 and the second sub-board 2012.

[0063] Furthermore, the thickness of cover plate 2 is T3, which satisfies 2 mm ≤ T3 ≤ 2.5 mm, to ensure that cover plate 2 has sufficient thickness, that is, sufficient structural strength.

[0064] Specifically, the average thickness of the first sub-board 2011, the second sub-board 2012, and the third sub-board 2013 is between 2 mm and 2.5 mm, for example, it can be any value among 2 mm, 2.3 mm, and 2.5 mm, or a value between any two values.

[0065] The process parameters of the embodiments of the present invention will be further described in detail below with reference to specific examples. These examples should not be construed as limiting the scope of protection claimed by the present invention.

[0066] Example 1: The cover plate 2 includes a first sub-plate 2011, two second sub-plates 2012, and two third sub-plates 2013. The first sub-plate 2011 is located in the middle, the two second sub-plates 2012 are located on opposite sides of the first sub-plate 2011 along the X direction, and the two third sub-plates 2013 are located on the side of the two second sub-plates 2012 away from the first sub-plate 2011 along the X direction. The housing 1 is correspondingly provided with a first step 1011, two second steps 1012, and two third steps 1013. The first sub-plate 2011 covers the first step 1011, the two second sub-plates 2012 respectively cover the second steps 1012, and the two third sub-plates 2013 respectively cover the third steps 1013. The terminal post 3 includes a positive terminal post 301 and a negative terminal post 302, which are respectively located on the two third sub-plates 2013. The housing 1 includes a base plate 102, two large panels 103 located on opposite sides of the base plate 102 along the Y direction, and two narrow side panels 104 located on opposite sides of the base plate 102 along the X direction. The first step 1011, the second step 1012, and the third step 1013 are all located on the top of the large panels 103.

[0067] Among them, the height H1 of the narrow side plate 104 along the Z direction is 90 mm, the wall thickness T1 of the large panel 103 is 0.6 mm, the thickness T2 of the bottom plate 102 is 1 mm, the height H3 of the third step 1013 along the Z direction is 1.5 mm, the height H4 of the second step 1012 along the Z direction is 2 mm, and the height H5 of the first step 1011 along the Z direction is 2.2 mm. Therefore, H2 is H3 + H4 + H5 = 5.7 mm. 2 / (H1×T1) is 0.6, and H3 / T1 is 2.5. The sum of the outer surface areas S of each step portion 101 on each large panel 103 is 1035mm². 2 Therefore, S / (T1×1000) is 1.73. Simulation analysis and safety testing were performed on the battery cell; the test results are shown in Table 1.

[0068] Example 2: The cover plate 2 includes a first sub-plate 2011, two second sub-plates 2012, and two third sub-plates 2013. The first sub-plate 2011 is located in the middle, the two second sub-plates 2012 are located on opposite sides of the first sub-plate 2011 along the X direction, and the two third sub-plates 2013 are located on the side of the two second sub-plates 2012 away from the first sub-plate 2011 along the X direction. The housing 1 is correspondingly provided with a first step 1011, two second steps 1012, and two third steps 1013. The first sub-plate 2011 covers the first step 1011, the two second sub-plates 2012 respectively cover the second steps 1012, and the two third sub-plates 2013 respectively cover the third steps 1013. The terminal post 3 includes a positive terminal post 301 and a negative terminal post 302, which are respectively located on the two third sub-plates 2013. The housing 1 includes a base plate 102, two large panels 103 located on opposite sides of the base plate 102 along the Y direction, and two narrow side panels 104 located on opposite sides of the base plate 102 along the X direction. The first step 1011, the second step 1012, and the third step 1013 are all located on the top of the large panels 103.

[0069] Among them, the height H1 of the narrow side plate 104 along the Z direction is 92.5 mm, the wall thickness T1 of the large panel 103 is 0.63 mm, the thickness T2 of the bottom plate 102 is 1 mm, the height H3 of the third step 1013 along the Z direction is 1.6 mm, the height H4 of the second step 1012 along the Z direction is 2.2 mm, and the height H5 of the first step 1011 along the Z direction is 2.5 mm. Therefore, H2 is H3 + H4 + H5 = 6.3 mm. 2 / (H1×T1) is 0.68, and H3 / T1 is 2.54. The sum of the outer surface areas S of each step portion 101 on each large panel 103 is 1068 mm. 2 Therefore, S / (T1×1000) is 1.7. Simulation analysis and safety testing were performed on the battery cell; the test results are shown in Table 1.

[0070] Example 3: The cover plate 2 includes a first sub-plate 2011, two second sub-plates 2012, and two third sub-plates 2013. The first sub-plate 2011 is located in the middle, the two second sub-plates 2012 are located on opposite sides of the first sub-plate 2011 along the X direction, and the two third sub-plates 2013 are located on the side of the two second sub-plates 2012 away from the first sub-plate 2011 along the X direction. The housing 1 is correspondingly provided with a first step 1011, two second steps 1012, and two third steps 1013. The first sub-plate 2011 covers the first step 1011, the two second sub-plates 2012 respectively cover the second steps 1012, and the two third sub-plates 2013 respectively cover the third steps 1013. The terminal post 3 includes a positive terminal post 301 and a negative terminal post 302, which are respectively located on the two third sub-plates 2013. The housing 1 includes a base plate 102, two large panels 103 located on opposite sides of the base plate 102 along the Y direction, and two narrow side panels 104 located on opposite sides of the base plate 102 along the X direction. The first step 1011, the second step 1012, and the third step 1013 are all located on the top of the large panels 103.

[0071] Among them, the height H1 of the narrow side plate 104 along the Z direction is 95.8 mm, the wall thickness T1 of the large panel 103 is 0.65 mm, the thickness T2 of the bottom plate 102 is 1.1 mm, the height H3 of the third step 1013 along the Z direction is 1.65 mm, the height H4 of the second step 1012 along the Z direction is 2.3 mm, and the height H5 of the first step 1011 along the Z direction is 2.6 mm. Therefore, H2 is H3 + H4 + H5 = 6.55 mm. 2 H1 / T1 is 0.69, and H3 / T1 is 2.54. The sum of the outer surface areas S of the individual steps 101 on each large panel 103 is 1140 mm. 2 Therefore, S / (T1×1000) is 1.75. Simulation analysis and safety testing were performed on the battery cell; the test results are shown in Table 1.

[0072] Example 4: The cover plate 2 includes a first sub-plate 2011, two second sub-plates 2012, and two third sub-plates 2013. The first sub-plate 2011 is located in the middle, the two second sub-plates 2012 are located on opposite sides of the first sub-plate 2011 along the X direction, and the two third sub-plates 2013 are located on the side of the two second sub-plates 2012 away from the first sub-plate 2011 along the X direction. The housing 1 is correspondingly provided with a first step 1011, two second steps 1012, and two third steps 1013. The first sub-plate 2011 covers the first step 1011, the two second sub-plates 2012 respectively cover the second steps 1012, and the two third sub-plates 2013 respectively cover the third steps 1013. The terminal post 3 includes a positive terminal post 301 and a negative terminal post 302, which are respectively located on the two third sub-plates 2013. The housing 1 includes a base plate 102, two large panels 103 located on opposite sides of the base plate 102 along the Y direction, and two narrow side panels 104 located on opposite sides of the base plate 102 along the X direction. The first step 1011, the second step 1012, and the third step 1013 are all located on the top of the large panels 103.

[0073] Among them, the height H1 of the narrow side plate 104 along the Z direction is 98.3 mm, the wall thickness T1 of the large panel 103 is 0.65 mm, the thickness T2 of the bottom plate 102 is 1.1 mm, the height H3 of the third step 1013 along the Z direction is 1.9 mm, the height H4 of the second step 1012 along the Z direction is 2.5 mm, and the height H5 of the first step 1011 along the Z direction is 2.5 mm. Therefore, H2 is H3 + H4 + H5 = 6.9 mm. 2 H1 / T1 is 0.75, and H3 / T1 is 2.92. The sum of the outer surface areas S of the individual steps 101 on each large panel 103 is 1140 mm. 2 Therefore, S / (T1×1000) is 1.75. Simulation analysis and safety testing were performed on the battery cell; the test results are shown in Table 1.

[0074] Example 5: The cover plate 2 includes a first sub-plate 2011, two second sub-plates 2012, and two third sub-plates 2013. The first sub-plate 2011 is located in the middle, the two second sub-plates 2012 are located on opposite sides of the first sub-plate 2011 along the X direction, and the two third sub-plates 2013 are located on the side of the two second sub-plates 2012 away from the first sub-plate 2011 along the X direction. The housing 1 is correspondingly provided with a first step 1011, two second steps 1012, and two third steps 1013. The first sub-plate 2011 covers the first step 1011, the two second sub-plates 2012 respectively cover the second steps 1012, and the two third sub-plates 2013 respectively cover the third steps 1013. The terminal post 3 includes a positive terminal post 301 and a negative terminal post 302, which are respectively located on the two third sub-plates 2013. The housing 1 includes a base plate 102, two large panels 103 located on opposite sides of the base plate 102 along the Y direction, and two narrow side panels 104 located on opposite sides of the base plate 102 along the X direction. The first step 1011, the second step 1012, and the third step 1013 are all located on the top of the large panels 103.

[0075] Among them, the height H1 of the narrow side plate 104 along the Z direction is 102 mm, the wall thickness T1 of the large panel 103 is 0.7 mm, the thickness T2 of the bottom plate 102 is 1.1 mm, the height H3 of the third step 1013 along the Z direction is 1.8 mm, the height H4 of the second step 1012 along the Z direction is 2.8 mm, and the height H5 of the first step 1011 along the Z direction is 2.6 mm. Therefore, H2 is H3 + H4 + H5 = 7.2 mm. 2 / (H1×T1) is 0.73, and H3 / T1 is 2.57. The sum of the outer surface areas S of each step portion 101 on each large panel 103 is 1263.8 mm. 2 Therefore, S / (T1×1000) is 1.81. Simulation analysis and safety testing were performed on the battery cell; the test results are shown in Table 1.

[0076] Example 6: The cover plate 2 includes a first sub-plate 2011, two second sub-plates 2012, and two third sub-plates 2013. The first sub-plate 2011 is located in the middle, the two second sub-plates 2012 are located on opposite sides of the first sub-plate 2011 along the X direction, and the two third sub-plates 2013 are located on the side of the two second sub-plates 2012 away from the first sub-plate 2011 along the X direction. The housing 1 is correspondingly provided with a first step 1011, two second steps 1012, and two third steps 1013. The first sub-plate 2011 covers the first step 1011, the two second sub-plates 2012 respectively cover the second steps 1012, and the two third sub-plates 2013 respectively cover the third steps 1013. The terminal post 3 includes a positive terminal post 301 and a negative terminal post 302, which are respectively located on the two third sub-plates 2013. The housing 1 includes a base plate 102, two large panels 103 located on opposite sides of the base plate 102 along the Y direction, and two narrow side panels 104 located on opposite sides of the base plate 102 along the X direction. The first step 1011, the second step 1012, and the third step 1013 are all located on the top of the large panels 103.

[0077] Among them, the height H1 of the narrow side plate 104 along the Z direction is 103.8 mm, the wall thickness T1 of the large panel 103 is 0.7 mm, the thickness T2 of the bottom plate 102 is 1.2 mm, the height H3 of the third step 1013 along the Z direction is 2 mm, the height H4 of the second step 1012 along the Z direction is 3 mm, and the height H5 of the first step 1011 along the Z direction is 2.8 mm. Therefore, H2 is H3 + H4 + H5 = 7.8 mm. 2 / (H1×T1) is 0.84, and H3 / T1 is 2.86. The sum of the outer surface areas S of each step portion 101 on each large panel 103 is 1271.3 mm. 2 Therefore, S / (T1×1000) is 1.82. Simulation analysis and safety testing were performed on the battery cell; the test results are shown in Table 1.

[0078] Example 7: The cover plate 2 includes a first sub-plate 2011, two second sub-plates 2012, and two third sub-plates 2013. The first sub-plate 2011 is located in the middle, the two second sub-plates 2012 are located on opposite sides of the first sub-plate 2011 along the X direction, and the two third sub-plates 2013 are located on the side of the two second sub-plates 2012 away from the first sub-plate 2011 along the X direction. The housing 1 is correspondingly provided with a first step 1011, two second steps 1012, and two third steps 1013. The first sub-plate 2011 covers the first step 1011, the two second sub-plates 2012 respectively cover the second steps 1012, and the two third sub-plates 2013 respectively cover the third steps 1013. The terminal post 3 includes a positive terminal post 301 and a negative terminal post 302, which are respectively located on the two third sub-plates 2013. The housing 1 includes a base plate 102, two large panels 103 located on opposite sides of the base plate 102 along the Y direction, and two narrow side panels 104 located on opposite sides of the base plate 102 along the X direction. The first step 1011, the second step 1012, and the third step 1013 are all located on the top of the large panels 103.

[0079] Among them, the height H1 of the narrow side plate 104 along the Z direction is 106 mm, the wall thickness T1 of the large panel 103 is 0.75 mm, the thickness T2 of the bottom plate 102 is 1.2 mm, the height H3 of the third step 1013 along the Z direction is 2 mm, the height H4 of the second step 1012 along the Z direction is 3.2 mm, and the height H5 of the first step 1011 along the Z direction is 3 mm. Therefore, H2 is H3 + H4 + H5 = 8.2 mm. 2 / (H1×T1) is 0.85, and H3 / T1 is 2.67. The sum of the outer surface areas S of each step portion 101 on each large panel 103 is 1388 mm². 2 Therefore, S / (T1×1000) is 1.85. Simulation analysis and safety testing were performed on the battery cell; the test results are shown in Table 1.

[0080] Example 8: The cover plate 2 includes a first sub-plate 2011, two second sub-plates 2012, and two third sub-plates 2013. The first sub-plate 2011 is located in the middle, the two second sub-plates 2012 are located on opposite sides of the first sub-plate 2011 along the X direction, and the two third sub-plates 2013 are located on the side of the two second sub-plates 2012 away from the first sub-plate 2011 along the X direction. The housing 1 is correspondingly provided with a first step 1011, two second steps 1012, and two third steps 1013. The first sub-plate 2011 covers the first step 1011, the two second sub-plates 2012 respectively cover the second steps 1012, and the two third sub-plates 2013 respectively cover the third steps 1013. The terminal post 3 includes a positive terminal post 301 and a negative terminal post 302, which are respectively located on the two third sub-plates 2013. The housing 1 includes a base plate 102, two large panels 103 located on opposite sides of the base plate 102 along the Y direction, and two narrow side panels 104 located on opposite sides of the base plate 102 along the X direction. The first step 1011, the second step 1012, and the third step 1013 are all located on the top of the large panels 103.

[0081] Among them, the height H1 of the narrow side plate 104 along the Z direction is 118 mm, the wall thickness T1 of the large panel 103 is 0.8 mm, the thickness T2 of the bottom plate 102 is 1.2 mm, the height H3 of the third step 1013 along the Z direction is 2 mm, the height H4 of the second step 1012 along the Z direction is 3.5 mm, and the height H5 of the first step 1011 along the Z direction is 2.8 mm. Therefore, H2 is H3 + H4 + H5 = 8.3 mm. 2 / (H1×T1) is 0.73, and H3 / T1 is 2.5. The sum of the outer surface areas S of each step portion 101 on each large panel 103 is 1387.6 mm. 2 Therefore, S / (T1×1000) is 1.73. Simulation analysis and safety testing were performed on the battery cell; the test results are shown in Table 1.

[0082] Comparative Example 1: The cover plate 2 includes a first sub-plate 2011, two second sub-plates 2012, and two third sub-plates 2013. The first sub-plate 2011 is located in the middle, the two second sub-plates 2012 are located on opposite sides of the first sub-plate 2011 along the X direction, and the two third sub-plates 2013 are located on the side of the two second sub-plates 2012 away from the first sub-plate 2011 along the X direction. The housing 1 is correspondingly provided with a first step 1011, two second steps 1012, and two third steps 1013. The first sub-plate 2011 covers the first step 1011, the two second sub-plates 2012 respectively cover the second steps 1012, and the two third sub-plates 2013 respectively cover the third steps 1013. The terminal post 3 includes a positive terminal post 301 and a negative terminal post 302, which are respectively located on the two third sub-plates 2013. The housing 1 includes a base plate 102, two large panels 103 located on opposite sides of the base plate 102 along the Y direction, and two narrow side panels 104 located on opposite sides of the base plate 102 along the X direction. The first step 1011, the second step 1012, and the third step 1013 are all located on the top of the large panels 103.

[0083] Among them, the height H1 of the narrow side plate 104 along the Z direction is 98.3 mm, the wall thickness T1 of the large panel 103 is 0.6 mm, the thickness T2 of the bottom plate 102 is 1.1 mm, the height H3 of the third step 1013 along the Z direction is 1.9 mm, the height H4 of the second step 1012 along the Z direction is 2.5 mm, and the height H5 of the first step 1011 along the Z direction is 2.5 mm. Therefore, H2 is H3 + H4 + H5 = 6.9 mm. 2 / (H1×T1) is 0.81, H3 / T1 is 3.17, which is greater than 3. The sum of the outer surface areas S of each step portion 101 on each large panel 103 is 1028 mm. 2 Therefore, S / (T1×1000) is 1.71. Simulation analysis and safety testing were performed on the battery cell; the test results are shown in Table 1.

[0084] Comparative Example 2: The cover plate 2 includes a first sub-plate 2011, two second sub-plates 2012, and two third sub-plates 2013. The first sub-plate 2011 is located in the middle, the two second sub-plates 2012 are located on opposite sides of the first sub-plate 2011 along the X direction, and the two third sub-plates 2013 are located on the side of the two second sub-plates 2012 away from the first sub-plate 2011 along the X direction. The housing 1 is correspondingly provided with a first step 1011, two second steps 1012, and two third steps 1013. The first sub-plate 2011 covers the first step 1011, the two second sub-plates 2012 respectively cover the second steps 1012, and the two third sub-plates 2013 respectively cover the third steps 1013. The terminal post 3 includes a positive terminal post 301 and a negative terminal post 302, which are respectively located on the two third sub-plates 2013. The housing 1 includes a base plate 102, two large panels 103 located on opposite sides of the base plate 102 along the Y direction, and two narrow side panels 104 located on opposite sides of the base plate 102 along the X direction. The first step 1011, the second step 1012, and the third step 1013 are all located on the top of the large panels 103.

[0085] Among them, the height H1 of the narrow side plate 104 along the Z direction is 106 mm, the wall thickness T1 of the large panel 103 is 0.73 mm, the thickness T2 of the bottom plate 102 is 1.2 mm, the height H3 of the third step 1013 along the Z direction is 2 mm, the height H4 of the second step 1012 along the Z direction is 3.2 mm, and the height H5 of the first step 1011 along the Z direction is 3 mm. Therefore, H2 is H3 + H4 + H5 = 8.2 mm. 2 / (H1×T1) is 0.87, which is greater than 0.8, and H3 / T1 is 2.74. The sum of the outer surface areas S of each step portion 101 on each large panel 103 is 1259.8 mm. 2 Therefore, S / (T1×1000) is 1.73. Simulation analysis and safety testing were performed on the battery cell; the test results are shown in Table 1.

[0086] Comparative Example 3: The cover plate 2 includes a first sub-plate 2011, two second sub-plates 2012, and two third sub-plates 2013. The first sub-plate 2011 is located in the middle, the two second sub-plates 2012 are located on opposite sides of the first sub-plate 2011 along the X direction, and the two third sub-plates 2013 are located on the side of the two second sub-plates 2012 away from the first sub-plate 2011 along the X direction. The housing 1 is correspondingly provided with a first step 1011, two second steps 1012, and two third steps 1013. The first sub-plate 2011 covers the first step 1011, the two second sub-plates 2012 respectively cover the second steps 1012, and the two third sub-plates 2013 respectively cover the third steps 1013. The terminal post 3 includes a positive terminal post 301 and a negative terminal post 302, which are respectively located on the two third sub-plates 2013. The housing 1 includes a base plate 102, two large panels 103 located on opposite sides of the base plate 102 along the Y direction, and two narrow side panels 104 located on opposite sides of the base plate 102 along the X direction. The first step 1011, the second step 1012, and the third step 1013 are all located on the top of the large panels 103.

[0087] Among them, the height H1 of the narrow side plate 104 along the Z direction is 106 mm, the wall thickness T1 of the large panel 103 is 0.75 mm, the thickness T2 of the bottom plate 102 is 1.2 mm, the height H3 of the third step 1013 along the Z direction is 2 mm, the height H4 of the second step 1012 along the Z direction is 3.2 mm, and the height H5 of the first step 1011 along the Z direction is 3 mm. Therefore, H2 is H3 + H4 + H5 = 8.2 mm. 2 / (H1×T1) is 0.85, and H3 / T1 is 2.67. The sum of the outer surface areas S of each step portion 101 on each large panel 103 is 1418 mm. 2 Therefore, S / (T1×1000) is 1.89, which is greater than 1.85. Simulation analysis and safety testing were performed on the battery cell; the test results are shown in Table 1.

[0088] Table 1. Test Results

[0089] As can be seen from Table 1, in Examples 1 to 8, 0.6 ≤ H2 is satisfied. 2 / (H1×T1)≤0.85, 0.6mm≤T1≤0.8 mm, 90 mm≤H1≤120 mm, 1.7≤S / (T1×1000)≤1.85, 2.5≤H3 / T1≤3. Therefore, shell 1 has no abnormalities during the stamping process and can meet the requirements of each size and the structural strength test.

[0090] In Comparative Example 1, H3 / T1 exceeds the upper limit value of the embodiment of the present invention. After the shell 1 is stamped, the height of the third step 1013 is too large, the dimensions are difficult to meet the requirements, the structural strength is low, and the stamping yield is low.

[0091] In Comparative Example 2, H2 2 / (H1×T1) exceeds the upper limit value of the embodiment of the present invention. After the shell 1 is stamped, the height of the third step 1013 is too large, the dimensions are difficult to meet the requirements, the structural strength is low, and the stamping yield is low.

[0092] In Comparative Example 3, S / (T1×1000) exceeds the upper limit value of the embodiment of the present invention, the sum of the outer surface areas of each step portion 101 is too large, after the shell 1 is stamped, the dimensions are difficult to meet the requirements, the structural strength is low, and the stamping yield is low.

[0093] According to an embodiment of the present invention, another aspect provides a battery cell, mainly comprising: an electrode assembly and a battery cell housing assembly. The electrode assembly is disposed within the housing 1.

[0094] The battery cell provided in this embodiment of the invention features a cover plate 2 consisting of multiple sub-plates 201 arranged in a stepped configuration, which are then fitted with corresponding stepped portions 101 on the housing 1. This creates a stepped structure on the cover plate 2, with the terminal posts 3 mounted on the lower sub-plates 201. This design increases the contact area between the cover plate 2 and the battery pack cover, reduces the installation height of the terminal posts 3, and ensures that external impact forces first strike the middle sub-plates 201. The impact forces are then dispersed and transmitted to the housing 1 through the multiple sub-plates 201, allowing the entire battery cell housing assembly to withstand the impact and preventing stress concentration on the terminal posts 3, thus improving the structural strength and safety of the battery cell. Furthermore, it reduces the gap between the electrode assembly and the cover plate 2, improving the space utilization of the battery cell and thereby increasing its energy density.

[0095] According to an embodiment of the present invention, in another aspect, a battery pack is also provided, mainly comprising: a cover, a housing, and a plurality of battery cells, wherein the cover and the housing together form an accommodating space. The plurality of battery cells are disposed within the accommodating space.

[0096] Since the battery pack includes battery cells and has the same effect as the battery cells, it will not be elaborated on here.

[0097] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell housing assembly, characterized in that, include: The shell has an opening at one end along the Z direction; A cover plate is provided on the opening and connected to the housing. The cover plate includes a plurality of sub-plates connected sequentially along the X direction. A connecting part extending along the Z direction is provided between adjacent sub-plates. The installation height of each sub-plate along the Z direction decreases in a stepped manner from the middle to both ends. The end of the housing with the opening is provided with a plurality of stepped parts that support each sub-plate. The pole is located on the subplate at the end in the X direction.

2. The cell housing assembly according to claim 1, characterized in that, The housing includes a base plate, two large panels located on opposite sides of the base plate along the Y direction, and two narrow side plates located on opposite sides of the base plate along the X direction. Multiple stepped portions are located on the top of the large panels. The height of the narrow side plates along the Z direction is H1, and the sum of the heights of all the stepped portions along the Z direction is H2. The height of each stepped portion along the Z direction is the distance between its step surface and the step surface of the adjacent stepped portion. The wall thickness of the large panels is T1, satisfying 0.6 ≤ H2. 2 / (H1×T1)≤0.

85.

3. The cell housing assembly according to claim 2, characterized in that, 0.6 mm≤T1≤0.8 mm, 90 mm≤H1≤120 mm; And / or, the thickness of the base plate is T2, which satisfies 1 mm ≤ T2 ≤ 1.2 mm.

4. The cell housing assembly according to claim 2, characterized in that, The sum of the areas of the outer surfaces of each of the steps on each of the large panels is S, where S is constructed as the area enclosed by the projected outer contour of each step in the XZ plane and the top surface of the narrow side plate along the Z direction in the XZ plane, satisfying 1.7≤S / (T1×1000)≤1.

85.

5. The cell housing assembly according to claim 2, characterized in that, The plurality of steps include a first step, two second steps and two third steps. The two second steps are respectively located on opposite sides of the first step along the X direction. The two third steps are respectively located on the side of the two second steps away from the first step along the X direction. The height of the third step along the Z direction is H3, which satisfies 2.5≤H3 / T1≤3.

6. The cell housing assembly according to claim 5, characterized in that, Along the Z direction, the height between the step surface of the second step and the step surface of the third step is H4, and the height between the step surface of the first step and the step surface of the second step is H5, satisfying 2 mm ≤ H4 ≤ 3.5 mm and 2 mm ≤ H5 ≤ 3 mm. And / or, along the X direction, the distance between the third step and the adjacent side of the large panel is L1, satisfying 5 mm ≤ L1 ≤ 10 mm.

7. The cell housing assembly according to claim 5, characterized in that, The plurality of sub-boards include a first sub-board, two second sub-boards and two third sub-boards. The first sub-board is disposed on the first step, the two second sub-boards are disposed on the second step respectively, and the two third sub-boards are disposed on the third step respectively. The terminal post includes a positive terminal post and a negative terminal post, and the positive terminal post and the negative terminal post are disposed on the two third sub-boards respectively.

8. The cell housing assembly according to claim 7, characterized in that, The first sub-board is equipped with an explosion-proof valve, and the two second sub-boards are respectively coated with an adhesive layer, which is suitable for connecting to the battery pack cover through the adhesive layer.

9. A battery cell, characterized in that, include: pole group; The cell housing assembly according to any one of claims 1 to 8, wherein the electrode group is disposed within the housing.

10. A battery pack, characterized in that, include: The lid and body of the box together form the storage space; The battery cell according to multiple claims 9 is disposed within the receiving space.

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